CBigNum bnProofOfStakeLegacyLimit(~uint256(0) >> 24); // proof of stake target limit from block #15000 and until 20 June 2013, results with 0,00390625 proof of stake difficulty
CBigNum bnProofOfStakeLimit(~uint256(0) >> 27); // proof of stake target limit since 20 June 2013, equal to 0.03125 proof of stake difficulty
CBigNum bnProofOfStakeHardLimit(~uint256(0) >> 30); // disabled temporarily, will be used in the future to fix minimal proof of stake difficulty at 0.25
+uint256 nPoWBase = uint256("0x00000000ffff0000000000000000000000000000000000000000000000000000"); // difficulty-1 target
CBigNum bnProofOfWorkLimitTestNet(~uint256(0) >> 16);
int nCoinbaseMaturity = 500;
CBlockIndex* pindexGenesisBlock = NULL;
int nBestHeight = -1;
-CBigNum bnBestChainTrust = 0;
-CBigNum bnBestInvalidTrust = 0;
+
+uint256 nBestChainTrust = 0;
+uint256 nBestInvalidTrust = 0;
+
uint256 hashBestChain = 0;
CBlockIndex* pindexBest = NULL;
int64 nTimeBestReceived = 0;
// Settings
int64 nTransactionFee = MIN_TX_FEE;
-
+bool fStakeUsePooledKeys = false;
//////////////////////////////////////////////////////////////////////////////
//
}
// select stake target limit according to hard-coded conditions
-CBigNum static GetProofOfStakeLimit(int nHeight, unsigned int nTime)
+CBigNum inline GetProofOfStakeLimit(int nHeight, unsigned int nTime)
{
if(fTestNet) // separate proof of stake target limit for testnet
return bnProofOfStakeLimit;
}
// miner's coin stake reward based on nBits and coin age spent (coin-days)
-int64 GetProofOfStakeReward(int64 nCoinAge, unsigned int nBits, unsigned int nTime)
+int64 GetProofOfStakeReward(int64 nCoinAge, unsigned int nBits, unsigned int nTime, bool bCoinYearOnly)
{
- int64 nRewardCoinYear;
+ int64 nRewardCoinYear, nSubsidy, nSubsidyLimit = 10 * COIN;
if(fTestNet || nTime > STAKE_SWITCH_TIME)
{
CBigNum bnTargetLimit = GetProofOfStakeLimit(0, nTime);
bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
- // NovaCoin: reward for coin-year is cut in half every 64x multiply of PoS difficulty
- // A reasonably continuous curve is used to avoid shock to market
- // (nRewardCoinYearLimit / nRewardCoinYear) ** 6 == bnProofOfStakeLimit / bnTarget
- //
- // Human readable form:
- //
- // nRewardCoinYear = 1 / (posdiff ^ 1/6)
+ // NovaCoin: A reasonably continuous curve is used to avoid shock to market
+
+ CBigNum bnLowerBound = 1 * CENT, // Lower interest bound is 1% per year
+ bnUpperBound = bnRewardCoinYearLimit, // Upper interest bound is 100% per year
+ bnMidPart, bnRewardPart;
- CBigNum bnLowerBound = 1 * CENT; // Lower interest bound is 1% per year
- CBigNum bnUpperBound = bnRewardCoinYearLimit;
while (bnLowerBound + CENT <= bnUpperBound)
{
CBigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
if (fDebug && GetBoolArg("-printcreation"))
printf("GetProofOfStakeReward() : lower=%"PRI64d" upper=%"PRI64d" mid=%"PRI64d"\n", bnLowerBound.getuint64(), bnUpperBound.getuint64(), bnMidValue.getuint64());
- if (bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnTargetLimit > bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnTarget)
+
+ if(!fTestNet && nTime < STAKECURVE_SWITCH_TIME)
+ {
+ //
+ // Until 20 Oct 2013: reward for coin-year is cut in half every 64x multiply of PoS difficulty
+ //
+ // (nRewardCoinYearLimit / nRewardCoinYear) ** 6 == bnProofOfStakeLimit / bnTarget
+ //
+ // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/6)
+ //
+
+ bnMidPart = bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue;
+ bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
+ }
+ else
+ {
+ //
+ // Since 20 Oct 2013: reward for coin-year is cut in half every 8x multiply of PoS difficulty
+ //
+ // (nRewardCoinYearLimit / nRewardCoinYear) ** 3 == bnProofOfStakeLimit / bnTarget
+ //
+ // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/3)
+ //
+
+ bnMidPart = bnMidValue * bnMidValue * bnMidValue;
+ bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
+ }
+
+ if (bnMidPart * bnTargetLimit > bnRewardPart * bnTarget)
bnUpperBound = bnMidValue;
else
bnLowerBound = bnMidValue;
nRewardCoinYear = 5 * CENT;
}
- int64 nSubsidy = nCoinAge * 33 / (365 * 33 + 8) * nRewardCoinYear;
+ if(bCoinYearOnly)
+ return nRewardCoinYear;
+
+ // Fix problem with proof-of-stake rewards calculation since 20 Sep 2013
+ if(nTime < CHAINCHECKS_SWITCH_TIME)
+ nSubsidy = nCoinAge * 33 / (365 * 33 + 8) * nRewardCoinYear;
+ else
+ nSubsidy = nCoinAge * nRewardCoinYear * 33 / (365 * 33 + 8);
+
+ // Set reasonable reward limit for large inputs since 20 Oct 2013
+ //
+ // This will stimulate large holders to use smaller inputs, that's good for the network protection
+ if(fTestNet || STAKECURVE_SWITCH_TIME < nTime)
+ {
+ if (fDebug && GetBoolArg("-printcreation") && nSubsidyLimit < nSubsidy)
+ printf("GetProofOfStakeReward(): %s is greater than %s, coinstake reward will be truncated\n", FormatMoney(nSubsidy).c_str(), FormatMoney(nSubsidyLimit).c_str());
+
+ nSubsidy = min(nSubsidy, nSubsidyLimit);
+ }
+
if (fDebug && GetBoolArg("-printcreation"))
printf("GetProofOfStakeReward(): create=%s nCoinAge=%"PRI64d" nBits=%d\n", FormatMoney(nSubsidy).c_str(), nCoinAge, nBits);
return nSubsidy;
static const int64 nTargetTimespan = 7 * 24 * 60 * 60; // one week
// get proof of work blocks max spacing according to hard-coded conditions
-int64 static GetTargetSpacingWorkMax(int nHeight, unsigned int nTime)
+int64 inline GetTargetSpacingWorkMax(int nHeight, unsigned int nTime)
{
if(nTime > TARGETS_SWITCH_TIME)
return 3 * nStakeTargetSpacing; // 30 minutes on mainNet since 20 Jul 2013 00:00:00
}
//
-// minimum amount of work that could possibly be required nTime after
-// minimum work required was nBase
+// maximum nBits value could possible be required nTime after
//
-unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
+unsigned int ComputeMaxBits(CBigNum bnTargetLimit, unsigned int nBase, int64 nTime)
{
- CBigNum bnTargetLimit = bnProofOfWorkLimit;
-
CBigNum bnResult;
bnResult.SetCompact(nBase);
bnResult *= 2;
return bnResult.GetCompact();
}
+//
+// minimum amount of work that could possibly be required nTime after
+// minimum proof-of-work required was nBase
+//
+unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
+{
+ return ComputeMaxBits(bnProofOfWorkLimit, nBase, nTime);
+}
+
+//
+// minimum amount of stake that could possibly be required nTime after
+// minimum proof-of-stake required was nBase
+//
+unsigned int ComputeMinStake(unsigned int nBase, int64 nTime, unsigned int nBlockTime)
+{
+ return ComputeMaxBits(GetProofOfStakeLimit(0, nBlockTime), nBase, nTime);
+}
+
+
// ppcoin: find last block index up to pindex
const CBlockIndex* GetLastBlockIndex(const CBlockIndex* pindex, bool fProofOfStake)
{
void static InvalidChainFound(CBlockIndex* pindexNew)
{
- if (pindexNew->bnChainTrust > bnBestInvalidTrust)
+ if (pindexNew->nChainTrust > nBestInvalidTrust)
{
- bnBestInvalidTrust = pindexNew->bnChainTrust;
- CTxDB().WriteBestInvalidTrust(bnBestInvalidTrust);
+ nBestInvalidTrust = pindexNew->nChainTrust;
+ CTxDB().WriteBestInvalidTrust(CBigNum(nBestInvalidTrust));
uiInterface.NotifyBlocksChanged();
}
- CBigNum bnBestInvalidBlockTrust = pindexNew->bnChainTrust - pindexNew->pprev->bnChainTrust;
- CBigNum bnBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->bnChainTrust - pindexBest->pprev->bnChainTrust) : pindexBest->bnChainTrust;
+ uint256 nBestInvalidBlockTrust = pindexNew->nChainTrust - pindexNew->pprev->nChainTrust;
+ uint256 nBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->nChainTrust - pindexBest->pprev->nChainTrust) : pindexBest->nChainTrust;
- printf("InvalidChainFound: invalid block=%s height=%d trust=%s blocktrust=%s date=%s\n",
+ printf("InvalidChainFound: invalid block=%s height=%d trust=%s blocktrust=%"PRI64d" date=%s\n",
pindexNew->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->nHeight,
- pindexNew->bnChainTrust.ToString().c_str(), bnBestInvalidBlockTrust.ToString().c_str(),
+ CBigNum(pindexNew->nChainTrust).ToString().c_str(), nBestInvalidBlockTrust.Get64(),
DateTimeStrFormat("%x %H:%M:%S", pindexNew->GetBlockTime()).c_str());
- printf("InvalidChainFound: current best=%s height=%d trust=%s blocktrust=%s date=%s\n",
- hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
- bnBestChainTrust.ToString().c_str(),
- bnBestBlockTrust.ToString().c_str(),
+ printf("InvalidChainFound: current best=%s height=%d trust=%s blocktrust=%"PRI64d" date=%s\n",
+ hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
+ CBigNum(pindexBest->nChainTrust).ToString().c_str(),
+ nBestBlockTrust.Get64(),
DateTimeStrFormat("%x %H:%M:%S", pindexBest->GetBlockTime()).c_str());
}
uint64 nCoinAge;
if (!GetCoinAge(txdb, nCoinAge))
return error("ConnectInputs() : %s unable to get coin age for coinstake", GetHash().ToString().substr(0,10).c_str());
+
int64 nStakeReward = GetValueOut() - nValueIn;
- if (nStakeReward > GetProofOfStakeReward(nCoinAge, pindexBlock->nBits, nTime) - GetMinFee() + MIN_TX_FEE)
- return DoS(100, error("ConnectInputs() : %s stake reward exceeded", GetHash().ToString().substr(0,10).c_str()));
+ int64 nCalculatedStakeReward = GetProofOfStakeReward(nCoinAge, pindexBlock->nBits, nTime) - GetMinFee() + MIN_TX_FEE;
+
+ if (nStakeReward > nCalculatedStakeReward)
+ return DoS(100, error("ConnectInputs() : coinstake pays too much(actual=%"PRI64d" vs calculated=%"PRI64d")", nStakeReward, nCalculatedStakeReward));
}
else
{
bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck)
{
- // Check it again in case a previous version let a bad block in
- if (!CheckBlock(!fJustCheck, !fJustCheck))
+ // Check it again in case a previous version let a bad block in, but skip BlockSig checking
+ if (!CheckBlock(!fJustCheck, !fJustCheck, false))
return false;
// Do not allow blocks that contain transactions which 'overwrite' older transactions,
// Reorganize is costly in terms of db load, as it works in a single db transaction.
// Try to limit how much needs to be done inside
- while (pindexIntermediate->pprev && pindexIntermediate->pprev->bnChainTrust > pindexBest->bnChainTrust)
+ while (pindexIntermediate->pprev && pindexIntermediate->pprev->nChainTrust > pindexBest->nChainTrust)
{
vpindexSecondary.push_back(pindexIntermediate);
pindexIntermediate = pindexIntermediate->pprev;
pindexBest = pindexNew;
pblockindexFBBHLast = NULL;
nBestHeight = pindexBest->nHeight;
- bnBestChainTrust = pindexNew->bnChainTrust;
+ nBestChainTrust = pindexNew->nChainTrust;
nTimeBestReceived = GetTime();
nTransactionsUpdated++;
- CBigNum bnBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->bnChainTrust - pindexBest->pprev->bnChainTrust) : pindexBest->bnChainTrust;
+ uint256 nBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->nChainTrust - pindexBest->pprev->nChainTrust) : pindexBest->nChainTrust;
- printf("SetBestChain: new best=%s height=%d trust=%s blocktrust=%s date=%s\n",
- hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainTrust.ToString().c_str(),
- bnBestBlockTrust.ToString().c_str(),
+ printf("SetBestChain: new best=%s height=%d trust=%s blocktrust=%"PRI64d" date=%s\n",
+ hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
+ CBigNum(nBestChainTrust).ToString().c_str(),
+ nBestBlockTrust.Get64(),
DateTimeStrFormat("%x %H:%M:%S", pindexBest->GetBlockTime()).c_str());
// Check the version of the last 100 blocks to see if we need to upgrade:
}
// ppcoin: compute chain trust score
- pindexNew->bnChainTrust = (pindexNew->pprev ? pindexNew->pprev->bnChainTrust : 0) + pindexNew->GetBlockTrust();
+ pindexNew->nChainTrust = (pindexNew->pprev ? pindexNew->pprev->nChainTrust : 0) + pindexNew->GetBlockTrust();
// ppcoin: compute stake entropy bit for stake modifier
- if (!pindexNew->SetStakeEntropyBit(GetStakeEntropyBit(pindexNew->nHeight)))
+ if (!pindexNew->SetStakeEntropyBit(GetStakeEntropyBit(pindexNew->nTime)))
return error("AddToBlockIndex() : SetStakeEntropyBit() failed");
// ppcoin: record proof-of-stake hash value
return false;
// New best
- if (pindexNew->bnChainTrust > bnBestChainTrust)
+ if (pindexNew->nChainTrust > nBestChainTrust)
if (!SetBestChain(txdb, pindexNew))
return false;
-bool CBlock::CheckBlock(bool fCheckPOW, bool fCheckMerkleRoot) const
+bool CBlock::CheckBlock(bool fCheckPOW, bool fCheckMerkleRoot, bool fCheckSig) const
{
// These are checks that are independent of context
// that can be verified before saving an orphan block.
if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
return DoS(100, error("CheckBlock() : size limits failed"));
- // Special short-term limits to avoid 10,000 BDB lock limit:
- if (GetBlockTime() < LOCKS_SWITCH_TIME)
- {
- // Rule is: #unique txids referenced <= 4,500
- // ... to prevent 10,000 BDB lock exhaustion on old clients
- set<uint256> setTxIn;
- for (size_t i = 0; i < vtx.size(); i++)
- {
- setTxIn.insert(vtx[i].GetHash());
- if (i == 0) continue; // skip coinbase txin
- BOOST_FOREACH(const CTxIn& txin, vtx[i].vin)
- setTxIn.insert(txin.prevout.hash);
- }
- size_t nTxids = setTxIn.size();
- if (nTxids > 4500)
- return error("CheckBlock() : maxlocks violation");
- }
-
// Check proof of work matches claimed amount
if (fCheckPOW && IsProofOfWork() && !CheckProofOfWork(GetHash(), nBits))
return DoS(50, error("CheckBlock() : proof of work failed"));
if (IsProofOfStake())
{
- // ppcoin: coinbase output should be empty if proof-of-stake block
+ // Coinbase output should be empty if proof-of-stake block
if (vtx[0].vout.size() != 1 || !vtx[0].vout[0].IsEmpty())
- return error("CheckBlock() : coinbase output not empty for proof-of-stake block");
+ return DoS(100, error("CheckBlock() : coinbase output not empty for proof-of-stake block"));
// Second transaction must be coinstake, the rest must not be
if (vtx.empty() || !vtx[1].IsCoinStake())
// Check coinstake timestamp
if (!CheckCoinStakeTimestamp(GetBlockTime(), (int64)vtx[1].nTime))
return DoS(50, error("CheckBlock() : coinstake timestamp violation nTimeBlock=%"PRI64d" nTimeTx=%u", GetBlockTime(), vtx[1].nTime));
+
+ // NovaCoin: check proof-of-stake block signature
+ if (fCheckSig && !CheckBlockSignature(true))
+ return DoS(100, error("CheckBlock() : bad proof-of-stake block signature"));
}
else
{
// Check coinbase reward
if (vtx[0].GetValueOut() > (GetProofOfWorkReward(nBits) - nFee))
- return DoS(50, error("CheckBlock() : coinbase reward exceeded %s > %s",
- FormatMoney(vtx[0].GetValueOut()).c_str(),
- FormatMoney(GetProofOfWorkReward(nBits) - nFee).c_str()));
+ return DoS(50, error("CheckBlock() : coinbase reward exceeded (actual=%"PRI64d" vs calculated=%"PRI64d")",
+ vtx[0].GetValueOut(),
+ GetProofOfWorkReward(nBits) - nFee));
+
+ // Should we check proof-of-work block signature or not?
+ //
+ // * Always skip on TestNet
+ // * Perform checking for the first 9689 blocks
+ // * Perform checking since last checkpoint until 20 Sep 2013 (will be removed after)
+
+ if(!fTestNet && fCheckSig)
+ {
+ bool isAfterCheckpoint = (GetBlockTime() > Checkpoints::GetLastCheckpointTime());
+ bool checkEntropySig = (GetBlockTime() < ENTROPY_SWITCH_TIME);
+ bool checkPoWSig = (isAfterCheckpoint && GetBlockTime() < CHAINCHECKS_SWITCH_TIME);
+
+ // NovaCoin: check proof-of-work block signature
+ if ((checkEntropySig || checkPoWSig) && !CheckBlockSignature(false))
+ return DoS(100, error("CheckBlock() : bad proof-of-work block signature"));
+ }
}
// Check transactions
if (fCheckMerkleRoot && hashMerkleRoot != BuildMerkleTree())
return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
- // NovaCoin: check proof-of-stake block signature
- if (IsProofOfStake() || (!fTestNet && GetBlockTime() < CHAINCHECKS_SWITCH_TIME))
- {
- if (!CheckBlockSignature())
- return DoS(100, error("CheckBlock() : bad block signature"));
- }
return true;
}
if (!Checkpoints::CheckHardened(nHeight, hash))
return DoS(100, error("AcceptBlock() : rejected by hardened checkpoint lock-in at %d", nHeight));
- // ppcoin: check that the block satisfies synchronized checkpoint
- if (!Checkpoints::CheckSync(hash, pindexPrev))
- {
- if(!GetBoolArg("-nosynccheckpoints", false))
- {
- return error("AcceptBlock() : rejected by synchronized checkpoint");
- }
- else
- {
- strMiscWarning = _("WARNING: syncronized checkpoint violation detected, but skipped!");
- }
- }
-
- // Reject block.nVersion < 3 blocks since 95% threshold on mainNet and always on testNet:
- if (nVersion < 3 && ((!fTestNet && nHeight > 14060) || (fTestNet && nHeight > 0)))
- return error("CheckBlock() : rejected nVersion < 3 block");
+ // Check that the block satisfies synchronized checkpoint
+ if (!GetBoolArg("-nosynccheckpoints", false) && !Checkpoints::CheckSync(hash, pindexPrev))
+ return error("AcceptBlock() : rejected by synchronized checkpoint");
// Enforce rule that the coinbase starts with serialized block height
CScript expect = CScript() << nHeight;
return true;
}
-CBigNum CBlockIndex::GetBlockTrust() const
+uint256 CBlockIndex::GetBlockTrust() const
{
CBigNum bnTarget;
+ bnTarget.SetCompact(nBits);
- // Old protocol
+ if (bnTarget <= 0)
+ return 0;
+
+ /* Old protocol, will be removed later */
if (!fTestNet && GetBlockTime() < CHAINCHECKS_SWITCH_TIME)
- {
- CBigNum bnTarget;
- bnTarget.SetCompact(nBits);
+ return (IsProofOfStake()? ((CBigNum(1)<<256) / (bnTarget+1)).getuint256() : 1);
- if (bnTarget <= 0)
- return 0;
- return (IsProofOfStake()? (CBigNum(1)<<256) / (bnTarget+1) : 1);
- }
+ /* New protocol */
- // New protocol
- if (pprev == NULL || pprev->nHeight < 10)
- return 1;
+ // Calculate work amount for block
+ uint256 nPoWTrust = (CBigNum(nPoWBase) / (bnTarget+1)).getuint256();
+
+ // Set nPowTrust to 1 if we are checking PoS block or PoW difficulty is too low
+ nPoWTrust = (IsProofOfStake() || nPoWTrust < 1) ? 1 : nPoWTrust;
+
+ // Return nPoWTrust for the first 12 blocks
+ if (pprev == NULL || pprev->nHeight < 12)
+ return nPoWTrust;
const CBlockIndex* currentIndex = pprev;
if(IsProofOfStake())
{
- bnTarget.SetCompact(nBits);
- if (bnTarget <= 0)
- return 0;
+ CBigNum bnNewTrust = (CBigNum(1)<<256) / (bnTarget+1);
+ // Return 1/3 of score if parent block is not the PoW block
if (!pprev->IsProofOfWork())
- return (CBigNum(1)<<256) / (3 * (bnTarget+1));
+ return (bnNewTrust / 3).getuint256();
int nPoWCount = 0;
// Return 1/3 of score if less than 3 PoW blocks found
if (nPoWCount < 3)
- return (CBigNum(1)<<256) / (3 * (bnTarget+1));
+ return (bnNewTrust / 3).getuint256();
- return (CBigNum(1)<<256) / (bnTarget+1);
+ return bnNewTrust.getuint256();
}
else
{
+ CBigNum bnLastBlockTrust = CBigNum(pprev->nChainTrust - pprev->pprev->nChainTrust);
+
+ // Return nPoWTrust + 2/3 of previous block score if two parent blocks are not PoS blocks
if (!(pprev->IsProofOfStake() && pprev->pprev->IsProofOfStake()))
- return 1 + (2 * (pprev->bnChainTrust - pprev->pprev->bnChainTrust) / 3);
+ return nPoWTrust + (2 * bnLastBlockTrust / 3).getuint256();
int nPoSCount = 0;
currentIndex = currentIndex->pprev;
}
- // Return 2/3 of previous block score if less than 7 PoS blocks found
+ // Return nPoWTrust + 2/3 of previous block score if less than 7 PoS blocks found
if (nPoSCount < 7)
- return 1 + (2 * (pprev->bnChainTrust - pprev->pprev->bnChainTrust) / 3);
+ return nPoWTrust + (2 * bnLastBlockTrust / 3).getuint256();
+
+ bnTarget.SetCompact(pprev->nBits);
+
+ if (bnTarget <= 0)
+ return 0;
+
+ CBigNum bnNewTrust = (CBigNum(1)<<256) / (bnTarget+1);
- return (pprev->bnChainTrust - pprev->pprev->bnChainTrust);
+ // Return nPoWTrust + full trust score for previous block nBits
+ return nPoWTrust + bnNewTrust.getuint256();
}
}
// ppcoin: verify hash target and signature of coinstake tx
if (pblock->IsProofOfStake())
{
- uint256 hashProofOfStake = 0;
- if (!CheckProofOfStake(pblock->vtx[1], pblock->nBits, hashProofOfStake))
+ uint256 hashProofOfStake = 0, targetProofOfStake = 0;
+ if (!CheckProofOfStake(pblock->vtx[1], pblock->nBits, hashProofOfStake, targetProofOfStake))
{
printf("WARNING: ProcessBlock(): check proof-of-stake failed for block %s\n", hash.ToString().c_str());
return false; // do not error here as we expect this during initial block download
CBigNum bnNewBlock;
bnNewBlock.SetCompact(pblock->nBits);
CBigNum bnRequired;
- bnRequired.SetCompact(ComputeMinWork(GetLastBlockIndex(pcheckpoint, pblock->IsProofOfStake())->nBits, deltaTime));
+
+ if (pblock->IsProofOfStake())
+ bnRequired.SetCompact(ComputeMinStake(GetLastBlockIndex(pcheckpoint, true)->nBits, deltaTime, pblock->nTime));
+ else
+ bnRequired.SetCompact(ComputeMinWork(GetLastBlockIndex(pcheckpoint, false)->nBits, deltaTime));
+
if (bnNewBlock > bnRequired)
{
if (pfrom)
}
// ppcoin: check block signature
-bool CBlock::CheckBlockSignature() const
+bool CBlock::CheckBlockSignature(bool fProofOfStake) const
{
if (GetHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet))
return vchBlockSig.empty();
vector<valtype> vSolutions;
txnouttype whichType;
- if(IsProofOfStake())
+ if(fProofOfStake)
{
const CTxOut& txout = vtx[1].vout[1];
strStatusBar = strMiscWarning;
}
- // ppcoin: should not enter safe mode for longer invalid chain
- // ppcoin: if sync-checkpoint is too old do not enter safe mode
- if (Checkpoints::IsSyncCheckpointTooOld(60 * 60 * 24 * 10) && !fTestNet && !IsInitialBlockDownload())
+ // * Should not enter safe mode for longer invalid chain
+ // * If sync-checkpoint is too old do not enter safe mode
+ // * Do not display warning if -nosynccheckpoints specified
+ if (!GetBoolArg("-nosynccheckpoints", false) && Checkpoints::IsSyncCheckpointTooOld(60 * 60 * 24 * 10) && !fTestNet && !IsInitialBlockDownload())
{
nPriority = 100;
strStatusBar = "WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers.";
nPriority = alert.nPriority;
strStatusBar = alert.strStatusBar;
if (nPriority > 1000)
- strRPC = strStatusBar; // ppcoin: safe mode for high alert
+ strRPC = strStatusBar;
}
}
}
CInv inv(MSG_TX, tx.GetHash());
pfrom->AddInventoryKnown(inv);
+ // Truncate messages to the size of the tx in them
+ unsigned int nSize = ::GetSerializeSize(tx,SER_NETWORK, PROTOCOL_VERSION);
+ if (nSize < vMsg.size()){
+ vMsg.resize(nSize);
+ }
+
bool fMissingInputs = false;
if (tx.AcceptToMemoryPool(txdb, true, &fMissingInputs))
{
else if (strCommand == "getaddr")
{
+ // Don't return addresses older than nCutOff timestamp
+ int64 nCutOff = GetTime() - (nNodeLifespan * 24 * 60 * 60);
pfrom->vAddrToSend.clear();
vector<CAddress> vAddr = addrman.GetAddr();
BOOST_FOREACH(const CAddress &addr, vAddr)
- pfrom->PushAddress(addr);
+ if(addr.nTime > nCutOff)
+ pfrom->PushAddress(addr);
}
// fProofOfStake: try (best effort) to make a proof-of-stake block
CBlock* CreateNewBlock(CWallet* pwallet, bool fProofOfStake)
{
- CReserveKey reservekey(pwallet);
-
// Create new block
auto_ptr<CBlock> pblock(new CBlock());
if (!pblock.get())
txNew.vin.resize(1);
txNew.vin[0].prevout.SetNull();
txNew.vout.resize(1);
- txNew.vout[0].scriptPubKey << reservekey.GetReservedKey() << OP_CHECKSIG;
+
+ if (!fProofOfStake)
+ {
+ CReserveKey reservekey(pwallet);
+ txNew.vout[0].scriptPubKey << reservekey.GetReservedKey() << OP_CHECKSIG;
+ }
+ else
+ txNew.vout[0].SetEmpty();
// Add our coinbase tx as first transaction
pblock->vtx.push_back(txNew);
// Limit to betweeen 1K and MAX_BLOCK_SIZE-1K for sanity:
nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SIZE-1000), nBlockMaxSize));
- // Special compatibility rule before 20 Aug: limit size to 500,000 bytes:
- if (GetAdjustedTime() < LOCKS_SWITCH_TIME)
- nBlockMaxSize = std::min(nBlockMaxSize, (unsigned int)(MAX_BLOCK_SIZE_GEN));
-
// How much of the block should be dedicated to high-priority transactions,
// included regardless of the fees they pay
unsigned int nBlockPrioritySize = GetArg("-blockprioritysize", 27000);
if (txCoinStake.nTime >= max(pindexPrev->GetMedianTimePast()+1, pindexPrev->GetBlockTime() - nMaxClockDrift))
{ // make sure coinstake would meet timestamp protocol
// as it would be the same as the block timestamp
- pblock->vtx[0].vout[0].SetEmpty();
pblock->vtx[0].nTime = txCoinStake.nTime;
pblock->vtx.push_back(txCoinStake);
}
uint256 hash = pblock->GetHash();
uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
- if (hash > hashTarget && pblock->IsProofOfWork())
- return error("BitcoinMiner : proof-of-work not meeting target");
+ if(!pblock->IsProofOfWork())
+ return error("CheckWork() : %s is not a proof-of-work block", hash.GetHex().c_str());
+
+ if (hash > hashTarget)
+ return error("CheckWork() : proof-of-work not meeting target");
//// debug print
- printf("BitcoinMiner:\n");
- printf("new block found \n hash: %s \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
+ printf("CheckWork() : new proof-of-stake block found \n hash: %s \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
pblock->print();
printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());
{
LOCK(cs_main);
if (pblock->hashPrevBlock != hashBestChain)
- return error("BitcoinMiner : generated block is stale");
+ return error("CheckWork() : generated block is stale");
// Remove key from key pool
reservekey.KeepKey();
// Process this block the same as if we had received it from another node
if (!ProcessBlock(NULL, pblock))
- return error("BitcoinMiner : ProcessBlock, block not accepted");
+ return error("CheckWork() : ProcessBlock, block not accepted");
}
return true;
}
-void static ThreadBitcoinMiner(void* parg);
+bool CheckStake(CBlock* pblock, CWallet& wallet)
+{
+ uint256 proofHash = 0, hashTarget = 0;
+ uint256 hash = pblock->GetHash();
+
+ if(!pblock->IsProofOfStake())
+ return error("CheckStake() : %s is not a proof-of-stake block", hash.GetHex().c_str());
+
+ // verify hash target and signature of coinstake tx
+ if (!CheckProofOfStake(pblock->vtx[1], pblock->nBits, proofHash, hashTarget))
+ return error("CheckStake() : proof-of-stake checking failed");
+
+ //// debug print
+ printf("CheckStake() : new proof-of-stake block found \n hash: %s \nproofhash: %s \ntarget: %s\n", hash.GetHex().c_str(), proofHash.GetHex().c_str(), hashTarget.GetHex().c_str());
+ pblock->print();
+ printf("out %s\n", FormatMoney(pblock->vtx[1].GetValueOut()).c_str());
+
+ // Found a solution
+ {
+ LOCK(cs_main);
+ if (pblock->hashPrevBlock != hashBestChain)
+ return error("CheckStake() : generated block is stale");
+
+ // Track how many getdata requests this block gets
+ {
+ LOCK(wallet.cs_wallet);
+ wallet.mapRequestCount[pblock->GetHash()] = 0;
+ }
+
+ // Process this block the same as if we had received it from another node
+ if (!ProcessBlock(NULL, pblock))
+ return error("CheckStake() : ProcessBlock, block not accepted");
+ }
-static bool fGenerateBitcoins = false;
-static bool fLimitProcessors = false;
-static int nLimitProcessors = -1;
+ return true;
+}
-void BitcoinMiner(CWallet *pwallet, bool fProofOfStake)
+void StakeMiner(CWallet *pwallet)
{
SetThreadPriority(THREAD_PRIORITY_LOWEST);
// Make this thread recognisable as the mining thread
- RenameThread("bitcoin-miner");
+ RenameThread("novacoin-miner");
- // Each thread has its own key and counter
- CReserveKey reservekey(pwallet);
+ // Each thread has its own counter
unsigned int nExtraNonce = 0;
- while (fProofOfStake)
+ while (true)
{
if (fShutdown)
return;
Sleep(1000);
if (fShutdown)
return;
- if (!fProofOfStake)
- return;
}
while (pwallet->IsLocked())
//
CBlockIndex* pindexPrev = pindexBest;
- auto_ptr<CBlock> pblock(CreateNewBlock(pwallet, fProofOfStake));
+ auto_ptr<CBlock> pblock(CreateNewBlock(pwallet, true));
if (!pblock.get())
return;
IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
- if (fProofOfStake)
+ if(pblock->IsProofOfStake())
{
- // ppcoin: if proof-of-stake block found then process block
- if (pblock->IsProofOfStake())
+ // Trying to sign a block
+ if (!pblock->SignBlock(*pwalletMain))
{
- if (!pblock->SignBlock(*pwalletMain))
- {
- strMintWarning = strMintMessage;
- continue;
- }
- strMintWarning = "";
- printf("StakeMiner : proof-of-stake block found %s\n", pblock->GetHash().ToString().c_str());
- SetThreadPriority(THREAD_PRIORITY_NORMAL);
- CheckWork(pblock.get(), *pwalletMain, reservekey);
- SetThreadPriority(THREAD_PRIORITY_LOWEST);
+ strMintWarning = strMintMessage;
+ continue;
}
- Sleep(500);
- continue;
- }
- }
-}
-void static ThreadBitcoinMiner(void* parg)
-{
- CWallet* pwallet = (CWallet*)parg;
- try
- {
- vnThreadsRunning[THREAD_MINER]++;
- BitcoinMiner(pwallet, false);
- vnThreadsRunning[THREAD_MINER]--;
- }
- catch (std::exception& e) {
- vnThreadsRunning[THREAD_MINER]--;
- PrintException(&e, "ThreadBitcoinMiner()");
- } catch (...) {
- vnThreadsRunning[THREAD_MINER]--;
- PrintException(NULL, "ThreadBitcoinMiner()");
- }
- nHPSTimerStart = 0;
- if (vnThreadsRunning[THREAD_MINER] == 0)
- dHashesPerSec = 0;
- printf("ThreadBitcoinMiner exiting, %d threads remaining\n", vnThreadsRunning[THREAD_MINER]);
-}
-
-
-void GenerateBitcoins(bool fGenerate, CWallet* pwallet)
-{
- fGenerateBitcoins = fGenerate;
- nLimitProcessors = GetArg("-genproclimit", -1);
- if (nLimitProcessors == 0)
- fGenerateBitcoins = false;
- fLimitProcessors = (nLimitProcessors != -1);
-
- if (fGenerate)
- {
- int nProcessors = boost::thread::hardware_concurrency();
- printf("%d processors\n", nProcessors);
- if (nProcessors < 1)
- nProcessors = 1;
- if (fLimitProcessors && nProcessors > nLimitProcessors)
- nProcessors = nLimitProcessors;
- int nAddThreads = nProcessors - vnThreadsRunning[THREAD_MINER];
- printf("Starting %d BitcoinMiner threads\n", nAddThreads);
- for (int i = 0; i < nAddThreads; i++)
- {
- if (!NewThread(ThreadBitcoinMiner, pwallet))
- printf("Error: NewThread(ThreadBitcoinMiner) failed\n");
- Sleep(10);
+ strMintWarning = "";
+ SetThreadPriority(THREAD_PRIORITY_NORMAL);
+ CheckStake(pblock.get(), *pwalletMain);
+ SetThreadPriority(THREAD_PRIORITY_LOWEST);
}
+
+ Sleep(500);
+ continue;
}
}
+
git://git.novaco.in / novacoin.git / blobdiff